Fur sewing machine



March'ZI, 1939; c. BONIS I FUR SEWING MACHINE Filed Jan. 14, 1958 3Sheets-Sheet l INVENTOR. (oeser Ben/s BY "Lu ATTORNEY.

March 21,1939. I NI 2,151,345

FUR SEWING MACHINE Filed Jan. 14, 1958 s Sheets-Sheet 2 INVENTOR. C0650f Ban/'5 ATTORNEY.

March 21, 1939. c, BQN|s 2,151,345

FUR SEWING MACHINE Filed Jan. 14, 1938 '3 S heets-Shee t s /f IN VENTOR.

BYL

ATTORNEY.

Patented Mar. 21,1939

; UNITED STATESPATENT OFFICE Application January 14, 1938, Serial No.184,925

1 mm.- (c1. 112-18) This invention relates to fur sewing machines andmore particularly to the driving mechanism of the material feeding disksthereof, said driving mechanism being of the intermittent type.

One object of the invention is the provision of a driving mechanism ofthis nature which is both positive and instantaneous on the forward andreturn stroke thereof.

Another object ofthe invention is the provision of a device of thecharacter referred to which will include means for positively brakingthe material feeding disks against rotation when the needle is in theforward or needle plate position.

A further object of the invention is the provision of a retainer forpositively holding the drive shaft of the device against rotation on theidle or return stroke of the clutching member forming a part of thedriving mechanism.

Another object is to produce a device of the character described inwhich the maximum simplicity of construction and operation is secured.

Other objects and advantages will appear as the nature of theimprovements is better understood, the invention consistingsubstantially in the novel arrangement and co-relation-of parts hereinfully described and illustrated in the accompanying drawings, whereinsimilar reference characters are used to' describe corresponding partsthroughout the several views, and then tical embodiment thereof, but theinvention is not to be restricted to the exact details of thisdisclosure, and the latter, therefore, is to' be understood from anillustrative, rather than a restrictive standpoint.

In the accompanying drawings;

Figure 1 is a side view in elevation of a fur sewing machine withsumcient of its mechanism shown to aid in the explanation of the presentinvention;

Figure 2 is a front view thereof;

Figure 3 is a fragmental sectional view taken on line 33 Figure 2;

V Figure 4 is a longitudinal sectional view taken on line 4-4 Figure 1with the worm gear represented diagrammatically;

Figure 5 is a sectional view taken on line 55 54 Figure 7 lsalongitudinal sectional view with the parts in somewhat differentposition than shown in Figure 4 of a modified form of the invention.

Referring now to Figures 1 to 6 of the drawings in detail l0 indicatesthe main drive shaft 5 of the machine upon which the usual drivingpulley H is mounted. Secured to the shaft I0 is an eccentric or cam l2encircling which there is a hub II of a lever M the lower end of whichis secured to the rear end of a horizontally dis- 10 posed rocker arm i5mounted upon a pivot I6 slidably adjustable in a slot I! in one wall ofthe machine frame I8. The rocker arm I5 is provided with an elongatedslot l9 to permit of adjustment of the pivot l6, 1

The driving mechanism for the material feeding device comprises ahorizontal drive shaft 20 mounted upon trunnions 2| and 22 and hassecured to one end thereof a drum 23 having a cylindrical recess orchamber 24 concentric with 20 the said shaft and in which is located aclutch member 25 loosely mounted upon the shaft 20. Thesaid member 25 isprovided with four undercuts or recesses 26 each of which is providedwithfa peripheral curved and eccentric surface 25 21. Projecting arms orextensions 28 are formed between the undercuts 26 and the saidextensions are each provided with an aperture or hole 30 in which thereis mounted a coiled spring 3| exerting a tension against a headed studor 30 plunger 32 in contact with a roller 33 to force the said rollertoward the narrow end of its undercut 26 and wedge same between theeccentric surface 21 and the peripheral surface of the recess or chamber24. 35 Secured to the member 25 by means of screws 35 is an end plate 36which is provided with a pair of ears 3! which carry screws 38, theheads of which are in engagement with one surface of an annular flange39 on the drum 23 40 to connect the end plate 36 to the drum and toprevent the clutching member 25 and rollers 33' from falling out of thechamber 24'. The end plate 35 is further provided with an ear orextension 40 (seeFigures 1 and 2) to which 45 is secured by means of astud 4| the forward. end 42 of the rocker arm l5. v

The end of the drum 23 opposite to the flange 33 is provided with arecess or depression 44 forming an annular ring 45 which is serrated 50to form a worm gear having teeth 46 adapted to mesh with the curvedworm-like teeth 41 of a gear 48 secured to the lower end of a verticalshaft 49 to the upper. end of which is secured one material feeding disk50. The shaft 49 is rotatably mounted in frame I8 and in a boss 5i atthe front of the said frame. Collars 52 and 53 secured to the shaft 49one above and the other below the boss 5| prevent vertical movement ofthe said shaft. A second material feeding .disk 54 in operativeengagement with the disk 50 is carried upon an arm 55 suitably supportedon the frame H3 at 56 and 51. The disk 54 is provided with the usualneedle plate 58 to receive the needle 59 when in forward position thesaid needle being carried by the needle,

. 62 concentric with the shaft 20 (see Figures 12, 3

and 4). Located within the said recess 62 is a clutch member 63 similarin all respects to the clutch member .25, but is provided with threeundercuts or recesses 64 each of which is provided with a peripheralcurved and eccentric surface 65. Arms-or extensions 66 formed betweenthe undercuts 64 are each provided with a hole or aperture 61 for thereception of a headed plunger 68 which is pressed forwardly against aroller 69 by means of a spring I to force the said roller toward thenarrow end of the undercut 64 and wedge same between the curved surface65 and the periphery of the chamber 62. Secured to the clutch member 63by means of screws H is a cover-plate 12 having an extension or arm I3(see Figure 3), which is fastened to the frame it of the machine bymeans ofv a screw 14. The plate is maintained in position on the housing6| by means of a headed screw 15 in engagement with a flange 16 on thesaid housing and by a plate 11 secured to the plate 12 and inengagementwith the flange l6.

The operation of the device is as follows;

Rocking movement to the rocker arm I is imparted by the eccentricoperated lever l4. When the rear end of the said rocker arm I5 is swungdownwardly the forward end of the said rocker arm will rotate the drum23 and gear 45 in clockwise direction through the connections 36, 4| andthe clutching member 25 and rollers 33, said movement being transferredto the shaft 20 and therethrough to the housing 6|. During the saidrotary movement the gear 45 will drive the material feeding disks 56 and54 through the gear 48 and shaft 49. When the lever l4 pulls the rear ofrocker arm upwardly the clutch member 25 will be carried or swung out ofwedging engagement with the rollers 33 and will idle back withoutrotating the shaft 20 or drum 23 untilthe rear of the rocker arm isagain swung downwardis accomplished by means of theplate 12 which issecured to the machine frame and held stationary by the screw 14. Itwill be remembered that the clutch member 63 is secured to the saidplate 12 and cannot therefore move out of wedging engagement with therollers 69, thus assuring and providing positive retaining means for thesaid shaft 20.

Due to the curvature of the gear-teeth and I- find that due to thecurved eccentric surv 41 practically all of the back lash between thesaid gears is eliminated thus providing a braking or looking actionbetween the gears 45 and 48 1 against manually rotating the materialfeeding disks. This braking action is very desirable or essential, sinceno movement of the disks 50 and 54 is permissible, during thev periodwhen the needle 59 in engagement with the needle plate 58, since suchmovement would cause the needle to break.- The period when theneedle isin engagement with the needle plate 58 corresponds or coincides with theperiod during which the driving clutch 25 is idling.

In Figure 7, I have shown a modified form of my invention wherein,instead of using a combined drum'and gear'in the driving clutchmechanism, I employ a gear 45 having the gear teeth 46 in the end edgethereof,.the said gear being secured to the shaft 23 by means of one ormore set screws 15. Secured to the rear wall of said gear'45 by means ofpins or'rivets I6 is a clutch member 25 which is in all respects similarto the clutch member 25 and is provided with the cooperating rollers 33and springs and plungers 3| and 32 respectively, the said rollers;springs and plungers-not being shown as the section is so taken wherethey cannot be seen. A separate loose fitting ring 11 encircles theclutch member the inner surface or circumference 18 thereof acting inthe same capacity as the surface 24 of the drum 23. Secured .to the ring11' is a cover plate 36* which is connected to the forward end of therocker arm l5.

The retaining means in this form of the invention.comprises a sleeve 80secured to the shaft 20, and to which sleeve desirable manner theclutching member 63. A ring or housing 6| sleeve 80 and has securedthereto the plate 12 the arm 13 of which istsecured to the frame of themachine as in the first form of my invention.

. there is secured in any is loosely mounted on the I spring pressedplungers 68 as shown in Figure 5.

The ring 6| and the plate 12 are maintained on the sleeve 80 by means ofa washer 8| and a headed over portion 82 at the end of the sleeve 8|).The plate 12 may be secured to the ring 6| by pins or rivets 83'or byany other suitable means.

The modified form of the invention herein shown like the form shown inFigures 1 to 6 is oscillated by the rocker arm l5, but instead of movingthe drum 23 and housing 6| about the respective clutching members 25 and63, the said .clutching members are moved within the respectiveinteriors of the ring 11 and housing 6|, the net'final results being thesame as in the form ofmy invention first described. v

From the foregoing it will be seen that I have provided a simple andefiicient intermittent driving mechanism for the material feeding disksof fur sewing machines, one which will positively and instantaneouslyclutch on the operating or material feeding end of the movement andwhich will just as readily and positively release on the idling orreturn end of the movement.

It will further be seen that my device also provides emcient braking andshaft retaining meanswhich will not permit of reverse movement of thedrive shaft on the return end of the driving clutch mechanism and willlikewise prevent any rotation of the material feeding disks when theneedle has penetrated the material sewn and is inv the needle plate.

Having described my invention, what II claim as new and desire to secureby Letters Patent is:

An intermittent driving mechanism for a sewing machine comprising ashaft, a drum secured to the shaft and having a recess at one end con-'centric with the shaft and having'a peripheral surface, a gear at theother end of said drum, a clutch member loosely mounted on the shaftwithin the recess of said drum and having peripheral secured to theclutch member, means for oscillating said plate, a shaft retainer'onsaid shaft in spaced relation to the clutching means, said retainercomprising a cup-shaped housing secured to the shaft and having an innerperipheral surface, a clutch member loosely mounted on the" shaft andhaving peripheral recesses with curved s and eccentric surfacesconfronting the peripheral surface of the housing, rollers in saidrecesses. spring pressed plungers carried by the clutch member to forceits rollers into wedging engagement with the interior peripheral surfaceof the in housing and the curved and eccentric clutch surfaces, a platesecu'redto the clutch member, a second shaftdisposed transversely of thefirst mentioned shaft intermediate the drum and the shaft retainer, anda gear on the second men- 1 tioned shaft in mesh with the firstmentioned gear.

A" CAESAR

